64636571 has 2 divisors, whose sum is σ = 64636572. Its totient is φ = 64636570.

The previous prime is 64636553. The next prime is 64636573. The reversal of 64636571 is 17563646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64636571 - 2¹⁴ = 64620187 is a prime.

Together with 64636573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64636573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32318285 + 32318286.

It is an arithmetic number, because the mean of its divisors is an integer number (32318286).

Almost surely, 2^64636571 is an apocalyptic number.

64636571 is a deficient number, since it is larger than the sum of its proper divisors (1).

64636571 is an equidigital number, since it uses as much as digits as its factorization.

64636571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 64636571 is about 8039.6872451607. The cubic root of 64636571 is about 401.3218167730.

The spelling of 64636571 in words is "sixty-four million, six hundred thirty-six thousand, five hundred seventy-one".